Your bildge pump should come on every few minutes. Even when not running!!!If it feels no back pressure it will shut off. If if feels pressure it will continue to pump until the water has vacated the PWC. To test the pump disconect a battery terminal and re connect it. You should hear your pump come on for a second or two. If not twist out the pump and look under it... maybe something is stuck to the bottom... clean it.
I hope this helps. Paul
Thank You, I'll give it a check...